When he is silent, the fool differs no whit from the wise. It is tongue and voice that betray his stupidity. Let him therefore put his finger to his lips and so mark silence, and turn himself into Egyptian Harpocrates.

1.Harpocrates, also known as Horus, was the son of the Egyptian divinity Isis. He avenged the murder of his father Osiris by Set/Typhon. He is often represented as an infant with his finger held to his mouth as a sign of silence and economy of words. See Plutarch, De Iside et Osiride 68.